docs: def eval_function(value):
      """ Evaluate a timestamp function """
      name, args = value[0], value[1:]
      if name == "NOW":
          return datetime.utcnow().replace(tzinfo=tzutc())
      elif name in ["TIMESTAMP", "TS"]:
          return parse(unwrap(args[0])).replace(tzinfo=tzlocal())
      elif name in ["UTCTIMESTAMP", "UTCTS"]:
          return parse(unwrap(args[0])).replace(tzinfo=tzutc())
      elif name == "MS":
          return 1000 * resolve(args[0])
      else:
          raise SyntaxError("Unrecognized function %r" % name)